38815261 has 2 divisors, whose sum is σ = 38815262. Its totient is φ = 38815260.

The previous prime is 38815247. The next prime is 38815289. The reversal of 38815261 is 16251883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20196036 + 18619225 = 4494^2 + 4315^2 .

It is a cyclic number.

It is not a de Polignac number, because 38815261 - 2⁹ = 38814749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38815201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19407630 + 19407631.

It is an arithmetic number, because the mean of its divisors is an integer number (19407631).

Almost surely, 2^38815261 is an apocalyptic number.

It is an amenable number.

38815261 is a deficient number, since it is larger than the sum of its proper divisors (1).

38815261 is an equidigital number, since it uses as much as digits as its factorization.

38815261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 34.

The square root of 38815261 is about 6230.1894834748. The cubic root of 38815261 is about 338.5848359023.

The spelling of 38815261 in words is "thirty-eight million, eight hundred fifteen thousand, two hundred sixty-one".